storm-compatibility-examples/src/java/org/apache/storm/examples/spout/RandomIntegerSpout.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.storm.examples.spout;

import java.util.Map;
import java.util.Random;
import java.util.logging.Logger;

import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseRichSpout;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Values;
import org.apache.storm.utils.Utils;

/**
 * Emits a random integer and a timestamp value (offset by one day),
 * every 100 ms. The ts field can be used in tuple time based windowing.
 */
public class RandomIntegerSpout extends BaseRichSpout {
  private static final Logger LOG = Logger.getLogger(RandomIntegerSpout.class.getName());
  private static final long serialVersionUID = 5454291010750852782L;
  private SpoutOutputCollector collector;
  private Random rand;
  private long msgId = 0;

  @Override
  public void declareOutputFields(OutputFieldsDeclarer declarer) {
    declarer.declare(new Fields("value", "ts", "msgid"));
  }

  @Override
  @SuppressWarnings("HiddenField")
  public void open(Map conf, TopologyContext context, SpoutOutputCollector
      collector) {
    this.collector = collector;
    this.rand = new Random();
  }

  @Override
  public void nextTuple() {
    Utils.sleep(100);
    collector.emit(new Values(rand.nextInt(1000),
        System.currentTimeMillis() - (24 * 60 * 60 * 1000), ++msgId), msgId);
  }

  @Override
  @SuppressWarnings("HiddenField")
  public void ack(Object msgId) {
    LOG.fine("Got ACK for msgId : " + msgId);
  }

  @Override
  @SuppressWarnings("HiddenField")
  public void fail(Object msgId) {
    LOG.fine("Got FAIL for msgId : " + msgId);
  }
}